chr14-21385721-ATCT-A

Position:

• chr14-21385721-ATCT-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BS1_Supporting BS2

The NM_001170629.2(CHD8):​c.7635_7637del​(p.Glu2545del) variant causes a inframe deletion change. The variant allele was found at a frequency of 0.00002 in 1,551,676 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000092 (0 hom., cov: 30)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: CHD8 NM_001170629.2 inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.37

Genes affected

CHD8 (HGNC:20153): (chromodomain helicase DNA binding protein 8) This gene encodes a member of the chromodomain-helicase-DNA binding protein family, which is characterized by a SNF2-like domain and two chromatin organization modifier domains. The encoded protein also contains brahma and kismet domains, which are common to the subfamily of chromodomain-helicase-DNA binding proteins to which this protein belongs. This gene has been shown to function in several processes that include transcriptional regulation, epigenetic remodeling, promotion of cell proliferation, and regulation of RNA synthesis. Allelic variants of this gene are associated with autism spectrum disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2016]

LOC107984643 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BS1: Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.0000121 (17/1399616) while in subpopulation AFR AF= 0.000443 (14/31598). AF 95% confidence interval is 0.000268. There are 0 homozygotes in gnomad4_exome. There are 11 alleles in male gnomad4_exome subpopulation. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High AC in GnomAd4 at 14 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHD8	NM_001170629.2	c.7635_7637del	p.Glu2545del	inframe_deletion	38/38	ENST00000646647.2
LOC107984643	XR_001750627.2	n.441+1014_441+1016del		intron_variant, non_coding_transcript_variant
CHD8	NM_020920.4	c.6798_6800del	p.Glu2266del	inframe_deletion	38/38

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHD8	ENST00000646647.2	c.7635_7637del	p.Glu2545del	inframe_deletion	38/38		NM_001170629.2	P3

Frequencies

GnomAD3 genomes AF: 0.0000921 AC: 14 AN: 152060 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.000266

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000380 AC: 6 AN: 157846 Hom.: 0 AF XY: 0.0000120 AC XY: 1 AN XY: 83268

Gnomad AFR exome AF: 0.000617

Gnomad AMR exome AF: 0.0000405

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000121 AC: 17 AN: 1399616 Hom.: 0 AF XY: 0.0000159 AC XY: 11 AN XY: 690316

Gnomad4 AFR exome AF: 0.000443

Gnomad4 AMR exome AF: 0.0000280

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000126

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000172

GnomAD4 genome AF: 0.0000921 AC: 14 AN: 152060 Hom.: 0 Cov.: 30 AF XY: 0.000135 AC XY: 10 AN XY: 74264

Gnomad4 AFR AF: 0.000266

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.000144

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 18, 2023	This variant, c.7635_7637del, results in the deletion of 1 amino acid(s) of the CHD8 protein (p.Glu2545del), but otherwise preserves the integrity of the reading frame. This variant is present in population databases (rs778470457, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with CHD8-related conditions. ClinVar contains an entry for this variant (Variation ID: 1902498). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Oct 03, 2022	In-frame deletion of 1 amino acid in a non-repeat region; In silico analysis supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs778470457; hg19: chr14-21853880;